Transparent, stretchable, self-healing, and self-adhesive ionogels for flexible multifunctional sensors and encryption systems

Zhou, Yang; Wang, Lulu; Liu, Yinping; Luo, Xiaohang; He, Yiqi; Niu, Yingchun; Xu, Quan

doi:10.1016/j.cej.2024.149632

Cited by 12 publications

(2 citation statements)

References 54 publications

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“…For network construction, design ideas usually include dual network structures [18][19][20], interpenetrating networks [21][22][23], copolymer single-layer network structures [24][25][26], etc. The materials that make up the ionogel network are largely based on polyelectrolytes and hydrophilic polymers, such as polyvinyl alcohol [17,27,28], polyacrylic acid [29,30], and polyacrylamide [31,32]. Based on these strategies, ionogels have generally achieved high transparency and stretchability [8,33].…”

Section: Introductionmentioning

confidence: 99%

Fluorine-Containing Ionogels with Stretchable, Solvent-Resistant, Wide Temperature Tolerance, and Transparent Properties for Ionic Conductors

Fan,

Feng,

Wang

et al. 2024

Polymers

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Stretchable ionogels, as soft ion-conducting materials, have generated significant interest. However, the integration of multiple functions into a single ionogel, including temperature tolerance, self-adhesiveness, and stability in diverse environments, remains a challenge. In this study, a new class of fluorine-containing ionogels was synthesized through photo-initiated copolymerization of fluorinated hexafluorobutyl methacrylate and butyl acrylate in a fluorinated ionic liquid 1-butyl-3-methyl imidazolium bis (trifluoromethylsulfonyl) imide. The resulting ionogels demonstrate good stretchability with a fracture strain of ~1300%. Owing to the advantages of the fluorinated network and the ionic liquid, the ionogels show excellent stability in air and vacuum, as well as in various solvent media such as water, sodium chloride solution, and hexane. Additionally, the ionogels display impressive wide temperature tolerance, functioning effectively within a wide temperature range from −60 to 350 °C. Moreover, due to their adhesive properties, the ionogels can be easily attached to various substrates, including plastic, rubber, steel, and glass. Sensors made of these ionogels reliably respond to repetitive tensile-release motion and finger bending in both air and underwater. These findings suggest that the developed ionogels hold great promise for application in wearable devices.

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Section: Introductionmentioning

confidence: 99%

Fluorine-Containing Ionogels with Stretchable, Solvent-Resistant, Wide Temperature Tolerance, and Transparent Properties for Ionic Conductors

Fan,

Feng,

Wang

et al. 2024

Polymers

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“…Hydrogels consist of highly cross-linked hydrophilic polymer networks and exhibit good biocompatibility, physicochemical properties, high water absorption, and water retention capabilities . By employing physical or chemical methods, these materials can be endowed with excellent multifunctional properties enabling their widespread use in electronic skins, − motion detection, − soft robotics, , fire protection and warning, and various other fields.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Performance of Multisensory Flexible Hydrogel toward Strain, Temperature, and Flame Sensing

An,

Wang,

Wang

et al. 2024

ACS Appl. Polym. Mater.

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The integration of enhanced mechanical properties, sensing capabilities, and thermal safety incorporating fire detection in flexible sensors continues to pose a significant challenge in the fields of materials science and multisensory technology. This study introduces a novel composite hydrogel integrating polyacrylamide (PAM) with graphene oxide (GO) and nickel ions (Ni 2+ ), offering enhanced mechanical strength, conductivity, and multifunctional sensing capabilities. A multifunctional composite hydrogel is developed by incorporating GO into PAM hydrogel, followed by Ni 2+ cross-linking. GO's inclusion forms a network with PAM chains via hydrogen bonds and interacts electrostatically with Ni 2+ , enhancing the hydrogel's mechanical properties and conductivity. Electromechanical tests confirm the hydrogel's efficacy in human motion detection and its potential in thermal safety and fire hazard detection, showcasing a significant advancement in multisensory technology. This composite material holds promise for broad applications in smart wearable devices and safety systems, bridging the gap between material science and practical implementation in safety-critical monitoring systems.

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Nucleobase‐Driven Wearable Ionogel Electronics for Long‐Term Human Motion Detection and Electrophysiological Signal Monitoring

Yan,

Zhao,

Lin

et al. 2024

Adv Funct Materials

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Ionogels are considered as ideal candidates for constructing flexible electronics due to their superior electrical conductivity, flexibility, high thermal and electrochemical stability. However, it remains a great challenge to simultaneously achieve high sensitivity, repeated adhesion, good self‐healing, and biocompatibility through a straightforward strategy. Herein, inspired by nucleobase‐tackified strategy, a multifunctional adhesive ionogel is developed through one‐step radical polymerization of acrylated adenine/uracil (Aa/Ua) and acrylic acid (AA) monomers in sodium caseinate (SC) stabilized liquid metal dispersions. As a soft conductive filler, the incorporating of liquid metal not only improves the electrical conductivity, but also enhances the mechanical strength, satisfying the stretchable sensing application. The large amount of noncovalent interactions (hydrogen bonding, metal coordination, and ion‐dipole interactions) within the networks enable the ionogels to possess excellent stretchability, skin‐like softness, good self‐healing, and strong adhesion. Based on these desirable characteristics, the ionogel is suitable for wearable strain sensors to precisely detect diverse human movements under extreme environments. Moreover, the seamless adhesion with human skin allows the ionogel to function as bioelectrode patch for long‐term and high‐quality electrophysiological signal acquisition. This research provides a promising strategy for designing ionogels with tailored functionalities for wearable electronics that satisfy diverse application requirements.

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Transparent, stretchable, self-healing, and self-adhesive ionogels for flexible multifunctional sensors and encryption systems

Cited by 12 publications

References 54 publications

Fluorine-Containing Ionogels with Stretchable, Solvent-Resistant, Wide Temperature Tolerance, and Transparent Properties for Ionic Conductors

Fluorine-Containing Ionogels with Stretchable, Solvent-Resistant, Wide Temperature Tolerance, and Transparent Properties for Ionic Conductors

Fabrication and Performance of Multisensory Flexible Hydrogel toward Strain, Temperature, and Flame Sensing

Nucleobase‐Driven Wearable Ionogel Electronics for Long‐Term Human Motion Detection and Electrophysiological Signal Monitoring

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